The Study of Multi-body Dynamic Dummy on Bicycle Collision

• Main Authors: Wen-Long Tseng, 曾文龍
• Other Authors: Li-Tung Chang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/96104475070305218003

碩士 === 國立成功大學 === 醫學工程研究所碩博士班 === 91 === Bicycles and lightweight motorcycles are extremely popular and provide a very important means of transportation in Taiwan, nevertheless bicycle and motorcycle accidents cause serious head injuries in riders. Wearing a helmet is the best method to prevent head injuries in traffic accidents. The helmet standard requires the protective performance of helmet against head injuries in accidents. However, the helmet standard does not completely meet the requirements of the riders in the impact-absorbing capacity and results in the insufficient protective performance of the helmet. The objective of this research is to establish a multi-body dynamics model to evaluate the kinematics process of rider in accidents. A multi-body dynamics model of rider based on Hybrid III 50﹪dummy was established with joints and spring-damping model to limit the range of motion and stiffness between the bodies. A contact model, force-penetration relationship, was used to describe the interface of bodies. The mathematical dynamics software MADYMO was used to simulate the kinematics process of rider, with EASi-CRASH MAD as pre- and post- processor. The results show that the spine horizontal timing (SPOT－H) of the simulated kinematics process of rider agreed with the experimental data of cadaver and dummy. The pattern of velocity of the head agreed with the test data, but the acceleration was not realistic. Angular velocity and acceleration of rider’s head could validate the boundary conditions of head-neck compositions. We have concluded that the multi-body dynamic model could apply to simulation of bicycle collision, but the model requires to modify the characteristics of joints, in which include range of motion, stiffness, friction, damping and hysteresis of joint.